Сверхкритические флюиды. Теория и практика
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2015, N4, pp. 04-10

K.A. Tatarenko, A.V. Lazarev

Microcapsulation of TiO2 Suspension in Poly(Ethylene Glycol) Solution in Supercritical СО2 Via its Pulse Expansion into Background Gases

Microencapsulation of titanium (IV) oxide nanoparticles in PEG 8000 via the pulse expansion of the jet of the polymer solution in the supercritical carbon dioxide into the background of sulfur hexafluoride and carbon dioxide is performed. The product preci pitates on the substrate either in globular or film form; the latter results from the intermolecular condensation of polymer coils. The effects of the type and pressure of the background gas in the range at 0.125 to 3 atm onto the quality and composition of the preci pitated product are studied. The globular form microcapsules or film consisting of a bulk product intermolecular condensation coils were obtained on substrate.

Key words: supercritical carbon dioxide, microencapsulation, pulsed supersonic jet, TiO2 nanoparticles


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